xizhang

// Zoom slider: linear zoom effect
fun updateZoomSlider(percentage: Float) {
  // percentage [0.0f .. 1.0f]
  cameraControl.setLinearZoom(percentage)
}

xizhang

val scaleDetector = ScaleGestureDetector(context, listener)

override fun onTouchEvent(event: MotionEvent) : Boolean {
  // Let the ScaleGestureDetector inspect all events
  scaleDetector.onTouchEvent(event)
  return true
}

val listener = object : ScaleGestureDetector.SimpleOnScaleGestureListener() {
  override fun onScale(detector: ScaleGestureDetector): Boolean {

xizhang

fun onTouch(x:Float, y:Float) {
  val meteringPoint = new DisplayOrientedMeteringPointFactory(mSurfaceView.getDisplay(), cameraSelector, mSurfaceView.getWidth(), mSurfaceView.getHeight()).createPoint(x.y);
  
  // Prepare focus action to be triggered.
  val action = FocusMeteringAction.Builder(meteringPoint).build();
  
  // Execute focus action
  cameraControl.startFocusAndMetering(action);
}

xizhang

// Set up use case

// Step 1. Config
val imageCapture = ImageCapture.Builder().setTargetResolution(Size(600, 800)).build()

// Step 2. Bind
CameraX.bindToLifecycle(lifecycleOwner, cameraSelector, imageCapture)

// Step 3. Act
imageCapture.takePicture(…)